A skinny 14-year-old boy, sick of getting picked on at school, steals his father's gun and goes on a shooting spree at his school. The cops, paramedics, and even firemen, of the 55 spend most of their shift dealing with the fall-out. Faith, mother of two young children, is particularly disturbed by the situation, and the news that there was a spot on her mammogram only adds to her bad day. Kim continues to struggle with her depression. Sully offers to help Tatiana get a legal green card.